刚性链嵌段共聚物的研究（Ⅲ）──PEEK／HTA有规嵌段共聚物的合成与性能

Studies on the Rigid-Rigid Block Copolymers(Ⅲ)──Synthesis and Properties of PEEK/HTA Block Copolymers

采用ＰＥＥＫ和ＨＴＡ齐聚物的溶液缩聚法制备了ＨＴＡ含量不同的刚性链嵌段共聚物系列样品，用ＩＲ、ＤＳＣ、ＴＧＡ、ＷＡＸＤ和动态粘弹谱等手段对共聚物进行表征并研究了热性能和结晶行为。结果表明，该组成范围的共聚物未发生微相分离，共聚物的结晶结构与ＰＥＥＫ相同，结晶度随ＨＴＡ含量增加而迅速下降。含ＨＴＡ３７．２４％的共聚物Ｔ_ｇ＝１８３℃，比纯ＰＥＥＫ高４０℃。新型嵌段共聚物的熔点稍低于ＰＥＥＫ，具有良好的力学性能。

A series of rigid-rigid block copolymers composed of poly(etheretherketone)(PEEK) and poly(arylethersulfone) with biphenyl structure(HTA) were synthesized by polycondensation.The characterization,thermal properties and crystallization behaviour of the block copolymers were investigated by DSC,TGA,WAXD,and dynamic viscoelastic measurement.The results show that for the copolymers no phase separation is observed.The copolymers are crystalline polymers similar to PEEK,the crystallinity measured by DSC decreases obviously with increasing HTA content.The Tg of the copolymer containing 37.24%HTA is 183℃,and is 40℃ higher than that of pure PEEK. The melting point of the copolymer is nearly as high as that of pure PEEK.The PEEK/HTA copolymers have very good high temperature mechanical property.